Carburetor



Feb. 16 1926.

P. A. DUMRAESE CARBURE'TOR Filied sept. 19-l 1921 A TTOHNEYS 'citizenVoff the AUnitec'l States, yaii'cl^a i"esiv dent of kklVfijlfortL"'in'thefcourity offfNew'vl y jHaven aiidffStateof Connecticut, lh'avein-l'16. Ths'c'onnection is a 'sliding'coniiection 'vented-a new -and"Improved Carburetor, 4 of' `which' following zal. fully c h'eafr,"landr"This iiivnti Y buretor in Which section 7 which presents an opening or`To all linkom it' Comparini j' i vBe 'it knownthat provide a carburetorin which the fuelV `and' the i end jacent the end `11 and Patented Feb.y16, 1926.` y

' am Crimineel), Y Y femmmes( f "iippiiaeibiiiiieii september 19,1921.'s efiailiwsenss. Y

' having -:bea-'ringf portion' l13 "adapted to 'en- 'g'age fthe .sleeveat the,` point that the kcone v 'section 1'5 ineigesiinto thetubularsection ."sothatf the' ti'ibiil'a-i""section 416 may slide yashort di's'tafnce ivifthfin the' sleeve*y 14 and jtheexact.,descriptionr "seat ies'tj` against 'a tapering conicalshapedfboreof sleeviel 1li.l This jbore on ie'latesjtocarburetorslaiid hasffor an".biectfftoj` rovideran improved construction-veliereiii t` ef quantity ofEaii" i's autoina ca lly controlled' the action" of immergemais ing 519whereby' fthe in which ia K conical-'shapedVl air 'controlled member. isrpioyided Wliich..gradiially opens as the suction"increases'.v n

A further object of the invention is to bore 17 d-oes not extend-to theend ofthe sleevellbut falls the end section V2O air arethoroughlycoininingled before leaving the"caiburetor Y An additional object istoprovide a carnone of the parts -maybe adjusted except the'needle forincreasingVv and decreasing the fuel opening. v ure 2,

In the accompanying drawing Ways 21 and from thence through the vari-Figure 1 is a top plan vien7 of the car-l ous openings `22m buretordisclosing one embodiment-of the out With thefuel through the throat 8.It invention. Figure 2 is a vertical section through Figure 1approximately on line 2-,2. Figure 3 fingers bythe longitudinal rreasonof this construction, When the cone 1.2 is unseated somewhat asv shownin Figof .slightly less diameter vtrance opening 23 18. When thecarburetor Vthan the opening is a detail bottom plan view of a sleeveembodying certain features of thev invention. f

Figure Il is a plan view of a controlling cone'einbodying certainfeatures of the' invention. d v f Referring tothe accompanying drawingby numerals, A1 indicates a float chamber which may be of any desiredkindand connected with the casing 2 by a .suitable connecting pipe 3.The casing 2 is provided Witha butterfly valve 4 of any usual orpreferred construction and controlled in the usual manner. v

In forming the casing 2 a body section 5 isprovided of a lcertaindiameter, a neck section 6 of a smaller diameter and an end on, the conesection 15 Will be fitting snugly againstthe bore v17 and theprincipalopening for the passa-ge ofl fueland'air Will be through theopening 23 though a small quan A tity of air may pass way y21 and aroundthe outside of the V.sleeve section 16. r

f The sleeve. 14: is provided with bores 24 and 25v which register withsuitable 'openvalve 26 may freely operate in the bore 21 and the jetor'nozzle 27 may be positioned the jet 27 so as to opening provided. Itwill be noted that throat 8 for receiving the butterfly valve Will bedischarged substantially centrally 4 and which also presents lanannularl .shoulder 9v againstv Which the spring 10 presses. The spring10also presses against 11 of cone 12. AThecone'12 is provided Withv asleeve or tubular section ada, conical-Shaped sec- 23 and iially intotheengine., At the same time, air will be drawn through opening 18 and thevariouspassagefvvays V21. Asthe section increases the Gone l2` will be@some1- Itfivifll be noted that the conficalshaped short thereofwhereby' acts as an annular ring but is dividedV into snralllprojections orgrooves 21."'By

will be noted lthat, the cone 12 has an en-V is standing still andthereis no suction there.l

through the passage@` the fuel regardless of the opening*provided7 tion'at lthe `opposite end, said conicalsection 'merges into anai'inular'opening 18' ivhich'in airV may pass throughthe passagev thecone 12 and finally Y ings in the casing 2l whereby the needle in thebore 25'. The pipe .3 is connected with supply 'fuel thereto While theneedle valve 26 vregulates the amount of of the passageway oi `opeiiiiig18 21nd,' con-v sequently, will be drawn .through opening Y lv movedagainst the action of spring l0 so as to provide `a greater and greateropening for the air passing through the opening 18 and the passage-Ways21. The provision of the various openings 22 in the cone l2 also Causesa better mixing and comminglingot the fuel and air before the combinedair and fuel pass out as substantially a gaa through the throat 8.

TVhen the engine is first started, the mixi ture ivill he much rio-lierthan after it has attained some speed as the amount of air in proportionto the fuel will be lees as moit ol: the air from the passage-Way 2l hasbeen Shut oli. As the engine speeds up and, eoneequentlyq does not needas rioh a mi2:- ture, the air will increase by reason ot the opening ofthe paseage-Ways 2l and also hy moving the opening 23 further Ytromopening 18. It is, of course, evident that more Could he provided in theusual Way by operatingthe needle valve 26 which is oonneeted with theaccelerator pedal. When startingin cold Weather, a rich mixturedesirable and, consequently, a valve or a @hooking member 28 1eprovidedvivlueh 1s in the nature of a butterfly valve and it isconnected with a suitable controlling lever 29. This lever may have arod or other member extend to the dashboard or some other convenientplace so as to be operated at any time.

What I claim is:-

A carburetor, oon'iprissing` a easing, a venturi positioned in theeasing formed with a tapering bore merging into a. Cylindrical innerslotted end, the slots in said Slotted end merging into passage-Waysextending to the opposite end of the venturi, a cone ooaeting with saidventuri formed with a foraminous tapering section adapted to engage theWalls of Said tapering bore, a solid cylindrical eeetion normallyfitting intoI said cylindrical inner end and closing said slots, and acentral bore extending entirely through the cone, a spring for normallyholdingthe cone so that the tapering seotion is engaging the Walls ofsaid tapering bore, and means for supplying fuel to the point oi'Smallestl diameter of the venturi.

PAUL ALEXANDER DUMRAESE.

